Oxidatively‐Stable Linear Poly(propylenimine)‐Containing Adsorbents for CO 2 Capture from Ultradilute Streams

Pang, Simon H.; Lively, Ryan P.; Jones, Christopher W.

doi:10.1002/cssc.201800438

Title: Oxidatively‐Stable Linear Poly(propylenimine)‐Containing Adsorbents for CO ₂ Capture from Ultradilute Streams

Journal Article · Mon Jul 09 00:00:00 EDT 2018 · ChemSusChem

DOI:https://doi.org/10.1002/cssc.201800438· OSTI ID:1459463

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School of Chemical &, Biomolecular Engineering Georgia Institute of Technology 311 Ferst Drive Atlanta GA 30332 USA

Abstract Aminopolymer‐based solid sorbents have been widely investigated for the capture of CO ₂ from dilute streams such as flue gas or ambient air. However, the oxidative stability of the widely studied aminopolymer, poly(ethylenimine) (PEI), is limited, causing it to lose its CO ₂ capture capacity after exposure to oxygen at elevated temperatures. Here, we demonstrate the use of linear poly(propylenimine) (PPI), synthesized through a simple cationic ring‐opening polymerization, as a more oxidatively stable alternative to PEI with high CO ₂ capacity and amine efficiency. The performance of linear PPI/SBA‐15 composites was investigated over a range of CO ₂ capture conditions (CO ₂ partial pressure, adsorption temperature) to examine the tradeoff between adsorption capacity and sorption‐site accessibility, which was expected to be more limited in linear polymers relative to the prototypical hyperbranched PEI. Linear PPI/SBA‐15 composites were more efficient at CO ₂ capture and retained 65–83 % of their CO ₂ capacity after exposure to a harsh oxidative treatment, compared to 20–40 % retention for linear PEI. Additionally, we demonstrated long‐term stability of linear PPI sorbents over 50 adsorption/desorption cycles with no loss in performance. Combined with other strategies for improving the oxidative stability and adsorption kinetics, linear PPI may play a role as a component of stable solid adsorbents in commercial applications for CO ₂ capture.

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Sponsoring Organization:: USDOE

OSTI ID:: 1459463

Journal Information:: ChemSusChem, Journal Name: ChemSusChem Vol. 11 Journal Issue: 15; ISSN 1864-5631

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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